249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection

Page:

383

Authors:

Koda, Jin; Wada, Keiichi

Abstract:

Steep central rises of rotation curves have been found in many spiral galaxies. There are two interpretations of these steep central rises: i) circular rotation around a central massive core, and ii) non-circular streaming motion caused by barlike distortion. Using gas dynamics simulations, we estimate the probability that steep central rises will be observed in barred galaxies, i.e., the probability that central galactic mass derived from rotation curves will be overestimated. We conclude that the upper limit of the probability is 20%, assuming a barred galaxy fraction of 50%. If we find steep central rises in more than 20% of galaxies, some of them must have central massive cores.